ABS material has the characteristics of high strength, corrosion resistance, high temperature resistance, light weight, wear resistance and durability, which increases the service life of the product. By training the reaction ability and strength between the fingers, the fingers are more flexible, the fingers are more dexterous, and the strength of the fingers is enhanced. Ergonomic and comfortable, compact and lightweight, it strengthens your forearm and wrist anytime, anywhere. Comfortable grip, four-finger fit, more power Large screen display, 42mm diameter, solid pointer display clearly With Our range of adjustable hand exercisers, you can gradually build and strengthen your hands and fingers. It"s easy to use and allows you to build up each finger"s grip based on current abilities and desired results. Ideal for athletes, it provides a complete strength training solution for fingers, hands, wrists and forearms and promotes finger strength, flexibility, coordination and speed. Product size: about 165mmx75mm